#include <iostream>
#include <iomanip>  // manipulation控制
using namespace std;

int main() {
    cout.setf(ios::left);
    cout << "打印小写字母表:\n";

    char ch = 'a';
    int i = 0;
    do {
        cout << setw(6) << ch;

        // 每7个换行
        i++;
        if (i % 7 == 0) {
            cout << "\n";
        }

        ch++;
    } while (ch <= 'z');

    cout << "\n";
}
